榛名山[ Haruna san ]Mt. Haruna

Mount Haruna (榛名山, Haruna-san) is a dormant stratovolcano in Gunma, eastern Honshū, Japan. Mount Haruna has many peaks and the tallest one, Mount Kamonga is 1,449 m high. It appeared about 300,000 years ago and the last known eruption was c. 550. The volcano has a summit caldera containing the symmetrical cone of Mount Harunafuji, along with a crater lake, Lake Haruna, along the western side. To the west of the lake is Mount Kamonga, the tallest peak.

from Mount_Haruna (Wikipedia) CC BY SA 3.0

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Gunma